Barack Obama, the US president, has mobilised the military to help deal with the spreading oil slick in the Gulf of Mexico.<br /><br />Endangered birds and animals in four US states are threatened by slick that Obama, said oil giant BP is ultimately responsible for.<br /><br />Experts fear the pollution could be worse than the Exxon Valdeez spill more than 20 years ago.<br /><br />The first traces of oil from the slick have now reached the mouth of the Mississippi river, but out to sea, the situation is much worse.<br /><br />Planes spraying dispersant chemicals on the oil slick are making little progress - while BP's crews fail to cap the ruptured well-pipe on the sea bottom and called for help from US Navy submarines.<br /><br />Al Jazeera's Sebastian Walker reports from Louisiana, where shrimp fishermen fear the worst.<br /><br />[30 April 2010]
